Measurement of plant leaf area

Four methods, namely copy-weighing method, ruler method,Sinpusen formula method and digital image processing method,are adopted to measure the edible cactus leaf area and compared as well.The result shows that there is remarkble linear relative relationship among four methods, and therefore those four methods are suitable to measure edible cactus palm area. Compared with other methods, digital image processing method is apt to be accepted,and suitable to measure other leaf area of plant too, because of its accuracy,simplicity and so on.